Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Contributions to noncontributory defined benefit plan			$ 540
Expected contributions to noncontributory defined benefit plan for the remainder of the year			540
Pension Benefits [Member]
Components of Net Periodic Benefit Cost:
Service cost	$ 181	$ 211	362	$ 422
Interest cost	318	307	636	614
Expected return on plan assets	(322)	(356)	(644)	(712)
Recognized net actuarial loss	124	127	248	254
Amortization of prior service cost	14	14	28	28
Settlement loss			0	0
Net Periodic Benefit Cost	$ 315	$ 303	$ 630	$ 606
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	4.22%	3.87%	4.22%	3.87%
Expected Long-Term Return on Plan Assets (as a percentage)	5.00%	5.25%	5.00%	5.25%
Rate of Compensation Increase (as a percentage)	3.00%	3.00%	3.00%	3.00%
Other Benefits [Member]
Components of Net Periodic Benefit Cost:
Service cost	$ 60	$ 55	$ 118	$ 112
Interest cost	64	63	128	128
Expected return on plan assets	(7)	(10)	(14)	(21)
Recognized net actuarial loss	22	18	44	35
Amortization of prior service cost	23	24	47	46
Settlement loss			114	0
Net Periodic Benefit Cost	$ 162	$ 150	$ 437	$ 300
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	4.09%	3.75%	4.08%	3.75%
Expected Long-Term Return on Plan Assets (as a percentage)	0.00%	0.00%	0.00%	0.00%
Rate of Compensation Increase (as a percentage)	3.01%	2.99%	3.01%	2.99%

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

Amount of contributions made by the employer to defined benefit plans.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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